Influence of Ar ion bombardment on the uniform corrosion resistance of laser-surface-melted Zircaloy-4

Zircaloy-4 specimens were surface treated by laser surface melting and/or Ar ion bombarding. Corrosion tests were conducted in a 1N H 2SO 4 solution at room temperature and transmission electron microscope (TEM) was employed to analyze the change of microstructures in the surface layer. The potentio...

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Bibliographic Details
Published in:Journal of nuclear materials 1999-03, Vol.265 (3), p.240-244
Main Authors: Xu, Jian, Bai, Xinde, He, Fei, Wang, Sheguan, He, Xinzhong, Fan, Yudian
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Installations for energy generation and conversion: thermal and electrical energy
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Summary:Zircaloy-4 specimens were surface treated by laser surface melting and/or Ar ion bombarding. Corrosion tests were conducted in a 1N H 2SO 4 solution at room temperature and transmission electron microscope (TEM) was employed to analyze the change of microstructures in the surface layer. The potentiodynamic tests showed that the corrosion current density, i corr, was closely related to the surface condition, and it decreased with increasing the fluence of Ar ions. After Ar ion bombardment, a significant improvement was achieved in the uniform corrosion resistance of laser-surface-melted Zircaloy-4 compared with that of the as-received Zircaloy-4. At the end, Gibbs free energy was used to explain why the fine grain structure and the fine dispersion of alloy components always led to the better uniform corrosion resistance.
ISSN:0022-3115
1873-4820
DOI:10.1016/S0022-3115(98)00732-6